May weather forecastMcAllen, TX
May
Weather in May
May in McAllen, Texas presents the onset of summer as temperatures continue to scale upwards. This period indicates a significant shift in weather while retaining the charm of long daylight hours. The daylight span further extends to 13.4 hours in May, offering ample hours of sunshine. However, May records an increased rainfall of 1.42" (36mm), indicating the start of the rainy season. Despite the rise in temperature and rainfall, May's weather remains well-suited for outdoor activities in McAllen, Texas.Temperature
The beginning of May records an average high-temperature of a still tropical 91.9°F (33.3°C), marking a negligible difference from April's 88.5°F (31.4°C). McAllen registers a consistent average low-temperature of 73°F (22.8°C) during May.Heat index
The heat index in May is evaluated at a blistering 111.2°F (44°C). Caution: Heat cramps along with heat exhaustion are expected. Sustained activity could lead to heatstroke.Heat index readings emphasize conditions of light breezes and shaded spots. A rise in the heat index by 15 Fahrenheit (8 Celsius) degrees may result from direct sunlight exposure.
Note: The heat index, also known as 'apparent temperature' or 'feels like', ties air temperature with relative humidity to produce the perceived temperature sensation. Additional elements encompassing metabolic differences, the degree of physical activity, and attire can impact the individual's perception of temperature. Remember, direct sunlight exposure can heighten the heat impact and might increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.
The natural method the human body uses to remove excess heat is by perspiring and letting sweat evaporate. Elevated relative humidity diminishes evaporation, thereby reducing the body's ability to shed heat and creating a feeling of being too warm. Rising body temperatures due to excess heat retention could signify impending heat disorders.
Humidity
With an average relative humidity of 68%, May is the most humid month.Rainfall
In McAllen, in May, it is raining for 9.3 days, with typically 1.42" (36mm) of accumulated precipitation. In McAllen, during the entire year, the rain falls for 103.3 days and collects up to 12.72" (323mm) of precipitation.Snowfall
February through December are months without snowfall.Daylight
The average length of the day in May is 13h and 26min.On the first day of May, sunrise is at 6:54 am and sunset at 8:05 pm. On the last day of the month, sunrise is at 6:40 am and sunset at 8:20 pm CDT.
Sunshine
In McAllen, Texas, the average sunshine in May is 10h.UV index
In McAllen, the average daily maximum UV index in May is 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for average individuals.Note: A maximum UV index of 7 in May translates into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
McAllen, TX
- Average high temperature in May: 91.9°F
The warmest month (with the highest average high temperature) is August (98.6°F).
The month with the lowest average high temperature is January (69.8°F).
- Average low temperature in May: 73°F
The month with the highest average low temperature is August (79.7°F).
The coldest month (with the lowest average low temperature) is January (53.2°F).
Average pressure in May
McAllen, TX
- Average pressure in May: 29.87"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The months with the lowest atmospheric pressure are May and June (29.87"Hg).
Average wind speed in May
McAllen, TX
- Average wind speed in May: 12.6mph
The windiest month (with the highest average wind speed) is May (12.6mph).
The calmest month (with the lowest average wind speed) is September (9.1mph).
Average humidity in May
McAllen, TX
- Average humidity in May: 68%
The month with the highest relative humidity is May (68%).
The month with the lowest relative humidity is August (59%).
Average rainfall in May
McAllen, TX
- Average rainfall in May: 1.42"
The wettest month (with the highest rainfall) is September (2.13").
The driest month (with the least rainfall) is February (0.47").
Average rainfall days in May
McAllen, TX
- Average rainfall days in May: 9.3 days
The month with the highest number of rainy days is September (15.4 days).
The month with the least rainy days is February (6.3 days).
Average snowfall in May
McAllen, TX
- Average snowfall in May: 0"
The month with the highest snowfall is January (0.12").
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in May
McAllen, TX
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (0.1 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in May /
Average sunshine in May
McAllen, TX
- Average daylight in May: 13h and 24min
The month with the longest days is June (Average daylight: 13h and 48min).
The month with the shortest days is December (Average daylight: 10h and 30min).
- Average sunshine in May: 10h and 0min
The month with the most sunshine is July (Average sunshine: 11h and 24min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
Average sunshine days in May
McAllen, TX
- Average sunshine days in May: 19.3 days
The month with the most sunshine days is July (23.5 days).
The month with the least sunshine days is September (12.5 days).
Average UV index in May
McAllen, TX
- Average UV index in May: 7
The months with the highest UV index are July and August (UV index 8).
The month with the lowest UV index is December (UV index 4).
Average cloud cover in May
McAllen, TX
- Average cloud cover in May: 32
The month with the most cloud cover is December (Cloud cover 39).
The month with the least cloud cover is August (Cloud cover 17).
Average visibility in May
McAllen, TX
- Average visibility in May: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
